F3 tornado, Gracey to Allegre, Kentucky, April 2, 2006

1. F040 to 72 mph

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. F173 to 112 mph

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. F2113 to 157 mph

   Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

4. F3158 to 206 mphthis tornado

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. F4207 to 260 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. F5261 to 318 mph

   Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

7. Unrated

   The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

Rating

F3

Date

April 2, 2006

Touchdown

8:50 PM CDT (01:50 UTC)

Path length

29.7 miles (47.8 km)

Path width

700 yards (640 m)

Deaths

0

Injuries

28

Property damage

$38 million

Counties

Christian and Todd counties

Touchdown point

36.900, -87.630

Lift-off point

36.930, -87.100

Record number

272

The tornado formed from a long-track supercell that originated in southeast Missouri near Poplar Bluff. The tornado began less than two miles from the Trigg County line with an east-southeast movement, then curved slightly left before crossing Highway 91. The tornado moved east-northeast across central Christian County, passing less than four miles north of downtown Hopkinsville, before crossing into Todd County less than a mile north of Pilot Rock. Near the beginning of the damage path, a church was levelled. Across the county, 91 homes were destroyed, and another 171 homes sustained varying degrees of damage. Several people were pulled from the debris of their homes during a door-to-door search that lasted into the next morning. Of the 22 people directly injured by the tornado, 17 were checked in at the local hospital, and five were transferred to regional hospitals. Another ten or so people received injuries not directly inflicted by the tornado, such as driving into fallen trees. None of the injuries, which consisted mostly of cuts, bruises, and fractures, were considered life-threatening. Numerous garages, barns, and outbuildings were destroyed. Some vehicles were damaged or destroyed. Hundreds of trees were downed, snapped, or uprooted. Power was out to most of the city of Hopkinsville for about six hours as a result of downed steel towers that carry primary transmission lines. Peak winds were estimated near 185 MPH. The average path width was 500 yards. It should be noted that the initial tornado reformed or reorganized about 7 miles northeast of Hopkinsville, leaving a break in the tornado path less than a mile long. Downburst wind damage occurred both north and south of the area where the tornado reorganized, resulting in a two-mile wide swath of damage along Highway 107. The webcam at the local hospital captured the tornado as it passed north of downtown Hopkinsville.

The tornado continued into Todd County from Christian County, crossing the county line near Pilot Rock. The tornado passed less than a mile north of the communities of Allegre and Cedar Grove, then dissipated about 2.5 miles before entering Logan County. Although damage was extensive in Todd County, the tornado was at its strongest and widest in Christian County. In Todd County, the tornado produced mainly F1 damage, although the tornado intensified into the lower F2 range near Allegre. A mobile home was destroyed in Allegre, and buildings were destroyed on Highway 171 about two miles north of Allegre. There was extensive damage to a church in Cedar Grove. Half of its roof was blown off, and windows were blown out. A total of two homes in Todd County were destroyed, and 28 other houses were significantly damaged. Close to two dozen sheds and barns were damaged or destroyed, along with at least one grain bin. Numerous trees were uprooted. Some farm machinery and vehicles were damaged or destroyed, including tractors and combines.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

16 minutes of warning. NWS PAH issued a tornado warning for this county at 01:34 UTC, 16 minutes before the tornado touched down, in force until 02:30 UTC.

The county was under a tornado watch, issued at 22:46 UTC and running to 05:00 UTC.

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The Storm Prediction Center had this point in a Moderate Risk, with a 0.15 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 01:19 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2006 tornado in KentuckyEvery tornado in Kentucky since 1950Warnings in force in Kentucky nowThe forecast where you are

66 more were confirmed in the United States that day.

All 67 of them

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.